题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223838-28531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223838-95817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-48237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223838-95817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-28031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-48237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223838-28531.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-69997.png)
解析
试题分析:首先根据题意列出
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-25459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223840-28875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223840-87337.png)
试题解析:解:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-28031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223839-48237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223840-45907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223840-28875.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223840-24903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223841-37614.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223841-81896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223841-17648.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223841-74021.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223842-44936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223842-89736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223838-28531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223842-13749.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223619-38477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223620-92285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223620-78501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223620-62502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223620-49844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223524-28571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223524-49329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223525-67029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223525-86299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223525-16479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223525-66758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223526-51726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223526-34967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223526-60889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223526-65499.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223526-99766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223527-88218.png)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223527-38613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223527-41657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223527-63420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223525-86299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223528-61021.png)
①若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223044-45535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223044-35644.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223044-42768.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-17474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223044-45535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-11663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-43521.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-17474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223044-45535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-11663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-43521.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-17474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223044-45535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-11663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223045-56377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223046-10404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223046-43348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008223046-29044.png)
A.①② | B.②③ | C.②④ | D.③④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222559-92335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222600-87333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222600-32990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222012-88953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222012-31485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222013-15292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222013-96143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222013-95062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222014-39418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222014-49653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222013-96143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222014-26228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222014-82291.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222012-88953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222014-49653.png)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222015-29906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222015-27892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222015-68965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008222015-67876.png)
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